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Zuo S.-M.,Tangshan Stainless Steel Co. | Liu B.-C.,Tang Shan Iron and Steel Group Heavy Machinery Co.
Zhuzao/Foundry | Year: 2015

At the end of the twentieth century, centrifugal composite high chromium cast iron rolls were applied to the strip rolling mill, namely the first F1-F3 frame of finish roll. During the use of grinding process, irregular soft point and cracks were found at the local surface of the high chromium cast iron roll after the eddy current inspection. These flaws must be ground before the roll is used again, which reduces the service life of roll, and increases roll consumption of per ton steel. The sampling of soft point and crack was analyzed, and the microstructure was observed. The reasons of the flaws were found and the effective solutions were put forward. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Gao Y.-Z.,Tang Shan Iron and Steel Group Heavy Machinery Co. | Sheng Q.,Tang Shan Iron and Steel Group Heavy Machinery Co. | Cao R.-R.,Tang Shan Iron and Steel Group Heavy Machinery Co.
Zhuzao/Foundry | Year: 2015

The defects such as off-block, roll neck fracture etc. appears during the use of the centrifugal composite high-speed steel roll in bar and wire rod mill. Through the study of these defects and the continuous optimization and practice process of compound centrifugal casting high speed steel roll, the roll defects probability in the use process is greatly reduced, and some defects have been eliminated completely. The benefit of enterprises has been improved and simultaneously quality recognition of the customers for the products is obtained. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Gao Y.-Z.,Tang Shan Iron and Steel Group Heavy Machinery Co. | Li Y.-C.,Tang Shan Iron and Steel Group Heavy Machinery Co. | Xiao L.-H.,Tang Shan Iron and Steel Group Heavy Machinery Co. | Liu T.-X.,Tang Shan Iron and Steel Group Heavy Machinery Co.
Zhuzao/Foundry | Year: 2013

Aiming to rolls working layer extensive spalling of centrifugal composite high chromium cast iron rolls during the heat treatment, metallographic examination and chemical analysis were carried out. And then the effective improvement measures were put forward and used successfully. Good practice effects were achieved. Source

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